Metallic arc welding nozzle



May 2, 1944. w. E. S'MITH METALLIC ARC WELDING NOZZLE Filed March 21, 1942 1 ffii* E 'INVENTOR WILLIAM E.5M|TH.

BY LX' ATTORNEY' Patented May 2,1944

ME'rALLroAzc WELDING NozzLE william E. smith, Detroit, Mich., signor to The Midland Steel Products Company, Cleveland, Ohio, a corporation of Ohio Application March zi, 1942, serial N 435,663

(ci. .21o-a) 8 Claims.

v tact for the electrode which is adjustable in several ways to compensate for the excessive wear imposed thereon.

Another important object of the invention is to provide a nozzle having a passage for the automatically fed wire or electrode, an adjustable conductor and an insulated contact piece engaging opposite sides ci the electrode whereby arcing is prevented and proper pressure is exercised upon the electrode by adjustmentof either or both the conductor and contact pieces Other objects and advantages of the invention will become apparent during the course of the l following description.

In the accompanying drawingforming a part ofthe application and wherein like numerals are employed to designate like parts throughout the several views,

Fig. 1 is a lbngitudinal section of the improved welding nozzle showing the position of the fusible electrode or wire therein,

Fig. 2 is a side elevation of the improved nozzle,

Fig. 3 is a transverse section of the same taken on the line 3-3 of Fig. 2, 1

Fig. 4 is a perspective view of the improved reversible and .adjustable conductor piece employed in conjunction with the nozzle.

Referring now more particularly to the drawing, wherein for the purposes of illustration is shown one of the preferred forms of the invention, the numeral 5 designates an electrode in the form of bare or dust-coated fusible weld wire usually delivered-to the welding nozzle 5 from a reel, not shown, from whence it is delivered to power driven feeding rolls, not shown, which positively feed the wire through. the nozzle as required. While some of this wire has a smooth passage of the weld wire.

exterior, one type used extensively has its exterior surface knurled or provided with indentations to facilitate feeding and electrical contact, but in either event,- when used in high speed welding, travels through the nozzle comparatively f ast and has som'ewhat the eiiect of a rat-tail ille upon the parts with which it contacts, with consequent rapid wear imposed thereon. It is therefore an important object of this invention to provide means for readily compensating for wear upon the exposed'parts, retarding such wear wherever possible, and insuring good electrical contact while preventingdetrimental arcing between the electrode and susceptible parts. This latterlobject is accomplished by providing only one.: live conductor and insulating the kpressure piece from the nozzle. p A

One end 'I 'of the nozzle 6 is of reduced section to be clamped in a suitable welding head equipped with means for positively feeding the wire 5 through the nozzle. This nozzle i's provided with a longitudinally extending -bore 8 larger than the diameter of the wire 5 and at its discharge end is enlarged and threaded as at 9 for the reception of an externally threaded sleeve or nipple I0 having a lon gitudinal passage with slight clearance for the One end of this nipple extends beyond the end of the nozzle to receive a tip II which is provided with a hardened wear resisting ring I2l which is entirely insulated from the tip and nipple as disclosed in my Letters Patent 2,289,938, datedA July 14, 1942. If desired, an insulating washer I3 is interposed between the end of the nozzle 6 and the welding tip I I as best s hown in Fig. .1.' As herein illustrated, the nozzle 5, nipple I0 and tip II are constructed from an electrical conductingmaterial such as copper, or these may be made entirely of hard electrical insulating material.

An intermediate portion of the bore 8 is enlarged asat I4 where electrical contact is made by a single conductor with the welding wire 5. A rectangular opening I5 is cut or milled transversely and 'diametrically through the nozzle at its enlarged bore portion from one side of the nozzle allV the way through to its opposite side where it is enlarged into a larger rectangular opening I6. Consequently, both of these openings I5 and I6 communicate and extend laterally from the enlarged portion I4 of the bore as illustrated and open on the exterior of the nozzle. Within the opening I5 is slidably and adjustably mounted an equi-lateral rectangular conductor piece or block .I'I of good electrical conductivity, such as copper or copper alloy. To this conductor may be secured, in any suitable manner, the lead of an electrical current.' A segment of the cylindrical nozzle 6 is chased out to form a lateral recess I8 exposing one broad side-of the opening I5 whereby a clamping bloclr I9 extending slightly beyond, may be firmly clamped in engagement with a broad side of the vconductor I1 by means of a pair of screws 20 threaded 4into the nozzle beyond opposite ends of the slot I5. Of course the nenaofnennsprmgn conductor is of a width to project into the recess Il to be engaged and clamped by the block il.

lengthwise into the nonle vto compensate 'for' wearasitoccurs.Anyoftheotherthreeunused orexposedgroovesnotbeinguaedtomgagethe u electrode, may be employed for damning n con- *.ductorwiretotl'ieblock.

.Inordertomn'intaintheweldvlrelingood electrical oontnet withthe conductor ",snin- .sulatedpi'essmepndoreontnctnleeeismoimtedinthelnteralopeningllandisprovidedwith ahardenedwearresistingmetnllieeontnet shoe ,removblysecuredinagroovein-thepleeell tothebodyofthenonlelhymeansotascrew inmermuxenmpmnmiimdenedshoemaybetimed slightly longitudinally .thntonlyoneendottheahumoybepressed' mtocontnctwlththeweldwirel Piece llmsy matienlly asitweersby looming or eliminating the clamping vlding 'n spring like 20 for the pressurepedllmnybeheldinfixed thenonzle,sndthespring2uaedto-snrmg mnunttheoonduetorpleee,

.Itwiilbeunderstoodthntvuiousehmgeo thesueshapegnderrangementofpertsmny 1180 y the invention or the :cove of the from said e, und an equi-lateral reetnngu-L lar conductor removably mounted in said lateral openinginanyoneotsevenlpositiomtopreaentdinerentedgelto tmdepossagethereinandalnternlopeningextending therefrom, and a rectangular conductor reversibly mounted in said latenl opening in either of twodiiierent positions to prent dwerentedgesthereofto-saideleetrodeasthe otheredgesweer.

Jimetnllicncweldingnoniehnvingen dectrode me therein and lateral openings* extending in alignment from opposite sides thereonspring weased'insnlatedpreasurened insaidnonieoppoliteonelntenl'openingand ensuingonelideofslideleehnde.andeeon duetorbodilyldjustablymoumedinnidother latergioneningsndengxgingthewitithdelirednlitesideoiseidelectromidnduethdngl rtedto witlwnt departing from the spirit nid'eieetrodeestheotherf 4.elimini.-mwemixmmnneimminency frietionally engaged with said electrode in said passage, said nozzle having a recess exposing one side of said conductor, and a clamping block disposed in said recess to firmly hold the conductor in its adjusted position.

7. A metallic arc welding' cylindrical nozzle having an electrode passage therein and a radial opening extending therefrom through the exterior surface of the nozzle, an adjustable conl ductor block extending exteriorly of said nozzle and being adjustable lengthwise in said radial opening to be frictionally engaged with said electrode, said nozzle having a segment chased out to expose one side of said conductor, and a clamping blockl disposed in said chased out segment to rmly hold the conductor in lits* adjusted position.

8. An arc welding nozzle having a passage therethrough to slidably receive an electrode and a lateral( opening extending therefrom, and a conductor bodily insertable into said lateral opening in any of a plurality ofv positions to engage different portions thereof with said electrode as other portions of the conductor become worn.

WILLIAM E. SMITH. 

